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Localization effect in single crystal of RuAs2

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Chinese Physics B 2024年第4期33卷 620-625页

作者：易哲铠刘琪光双魁徐升岳小宇梁慧李娜周颖吴丹丹孙燕李秋菊程鹏夏天龙孙学峰王义炎 Anhui Key Laboratory of Magnetic Functional Materials and Devices Institute of Physical Science and Information TechnologyAnhui University Department of Physics and Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS) University of Science and Technology of China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China School of Optical and Electronic Information Suzhou City University School of Physics and Optoelectronic Engineering Anhui University Collaborative Innovation Center of Advanced Microstructures Nanjing University

We report the magnetotransport and thermal properties of RuAs2single crystal. RuAs2exhibits semiconductor behavior and localization effect. The crossover from normal state to diffusive transport in the weak localization（WL） state and then to variable range hopping（VRH） transport in the strong localization state has been observed. The transitions can be reflected in the measurement of resistivity and Seebeck coefficient. Negative magnetoresistance（NMR） emerges with the appearance of localization effect and is gradually suppressed in high magnetic field. The temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to VRH. The measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization effect. Our findings show that RuAs2is a suitable platform to study the localized state.

关键词： RuAs2 single crystal variable range hopping weak localization

调谐负刚度-惯容质量阻尼器参数优化与地震响应控制

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振动工程学报 2024年第6期37卷 1015-1022页

作者：易举徐凯何晓晖华旭刚温青陈政清湖南大学土木工程学院湖南长沙410082 深圳市市政设计研究院有限公司广东深圳518029 湖南科技大学土木工程学院湖南湘潭411201

提出一种调谐负刚度-惯容质量阻尼器(TNIMD),用于地震作用下的结构减震控制。通过拉格朗日方程得到结构TNIMD耦合系统运动方程,采用定点理论进行TNIMD参数优化设计,讨论最优负刚度系数的取值,开展参数分析和减震效果验证。参数分析研究... 详细信息

提出一种调谐负刚度-惯容质量阻尼器(TNIMD),用于地震作用下的结构减震控制。通过拉格朗日方程得到结构TNIMD耦合系统运动方程,采用定点理论进行TNIMD参数优化设计,讨论最优负刚度系数的取值,开展参数分析和减震效果验证。参数分析研究表明:TNIMD对主结构位移响应的控制优于无负刚度元件下的调谐惯容质量阻尼器(VTMDI),且质量比及惯容比越小,TNIMD相对优势越大。减震分析结果表明:在远场、近场脉冲及近场无脉冲地震作用下,TNIMD对主结构位移及绝对加速度响应的控制效果均优于VTMDI,验证了TNIMD减震的优越性,为TNIMD研究提供参考。

关键词：惯容调谐质量阻尼器负刚度参数优化地震响应

A 3D-printed microfluidic gradient concentration chip for rapid antibiotic-susceptibility testing

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Bio-Design and Manufacturing 2022年第1期5卷 210-219页

作者： huilin Zhang Yuan Yao Yue hui Lu Zhang Nanjia Zhou Feng ju College of Environmental&Resource Sciences Zhejiang UniversityHangzhou 310058China Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province Hangzhou 310024China

The rise of antibiotic resistance as one of the most serious global public health threats has necessitated the timely clinical diagnosis and precise treatment of deadly bacterial infections.To identify which types and doses of antibiotics remain effective for fighting against multi-drug-resistant pathogens,the development of rapid and accurate antibiotic-susceptibility testing(AST)is of primary importance.Conventional methods for AST in well-plate formats with disk diffusion or broth dilution are both labor-intensive and operationally tedious.The microfluidic chip provides a versatile tool for evaluating bacterial AST and resistant behaviors.In this paper,we develop an operationally simple,3D-printed microfluidic chip for AST which automatically deploys antibiotic concentration gradients and fluorescence intensity-based reporting to ideally reduce the report time for AST to within 5 h.By harnessing a commercially available,digital light processing(DLP)3D printing method that offers a rapid,high-precision microfluidic chip-manufacturing capability,we design and realize the accurate generation of on-chip antibiotic concentration gradients based on flow resistance and diffusion mechanisms.We further demonstrate the employment of the microfluidic chip for the AST of E.coli to representative clinical antibiotics of three classes:ampicillin,chloramphenicol,and kanamycin.The determined minimum inhibitory concentration values are comparable to those reported by conventional well-plate methods.Our proposed method demonstrates a promising approach for realizing robust,convenient,and automatable AST of clinical bacterial pathogens.

关键词： Microfluidics Gradient concentration chip Digital light processing Antibiotic-susceptibility test Bacteria

High-resolution characterization of the fretting corrosion of Alloy 690 in the simulated secondary water of pressurized water reactor

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Journal of Materials Science & Technology 2023年第20期151卷 30-40页

作者： You Wang Zhangjian Zhou hui Wang Jiang ju Zhao Shen Xiaoqin Zeng School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu 610041China School of Materials Science and Engineering Shanghai Jiao Tong UniversityNo.800 Dongchuan RoadShanghai 200240China

The worn scars on Alloy 690 after the fretting corrosion testing in simulated pressurized water reactor(PWR)secondary water have been comprehensively analyzed by scanning transmission electron microscopy(STEM)and transmission Kikuchi diffraction(TKD).The high-quality characterization results experimentally show that the fretting wear accelerates the corrosion of Alloy 690 in two approaches.The first one is to break the integrity of the oxide scale by introducing cavities at the oxide grain boundaries.The second one is to alter the microstructure of the underneath matrix,forming a nano-grained matrix layer.The increased grain boundary density in this layer can accelerate the consumption of Cr in the near-surface matrix.The loss of oxide scale integrity and the accelerated Cr consumption are believed to contribute to the deteriorated corrosion resistance of Alloy 690 during the fretting corrosion process.

关键词： Alloy 690 Corrosion Fretting wear Transmission electron microscopy Transmission Kikuchi Diffraction

一例产后盆底肌筋膜疼痛综合征患者的病例分享

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四川生理科学杂志 2024年第5期46卷 1007-1010页

作者：周玲刘姣蒋惠瑜梁开如李菊惠东海县妇幼保健院江苏东海222300 眉山市妇幼保健院四川眉山620000 海南医学院第二附属医院海南海口570311

目的:盆底肌筋膜疼痛综合征(Myofascial pelvic pain syndrome,MPPS)通常起病隐匿,易延误治疗;且常表现为隐私部位疼痛和性交痛,患者羞于就诊,严重影响身心健康。现分享一例产后MPPS患者的诊疗经过,以期引起同行对此类患者的关注。结论... 详细信息

目的:盆底肌筋膜疼痛综合征(Myofascial pelvic pain syndrome,MPPS)通常起病隐匿,易延误治疗;且常表现为隐私部位疼痛和性交痛,患者羞于就诊,严重影响身心健康。现分享一例产后MPPS患者的诊疗经过,以期引起同行对此类患者的关注。结论:加强盆底康复的健康宣教,可以增加患者对MPPS的了解,消除或减轻就诊前的顾虑。在妇科检查中常规的加入阴道手指检查筛查盆底肌筋膜触发点(Myofascial Trigger Points,MTrPs)可以把MPPS的诊断提前到患者没有自觉症状或者仅隐约有症状的时候。

关键词：盆底肌筋膜疼痛综合征性交痛盆底康复健康宣教

出血性卒中复发相关危险因素分析及预测模型的构建与验证

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现代预防医学 2024年第1期51卷 21-26+54页

作者：董稳悦赵文举徐慧娜刘向哲河南中医药大学河南中医药大学第一附属医院

目的探讨出血性卒中患者复发相关危险因素，并构建相应风险预测模型，为降低出血性卒中复发率提供参考。方法纳入2020年1月1日—2022年12月31日河南中医药大学第一附属医院脑病科收治的出血性卒中患者为研究对象，以是否复发出血性卒... 详细信息

目的探讨出血性卒中患者复发相关危险因素，并构建相应风险预测模型，为降低出血性卒中复发率提供参考。方法纳入2020年1月1日—2022年12月31日河南中医药大学第一附属医院脑病科收治的出血性卒中患者为研究对象，以是否复发出血性卒中为因变量，收集患者的临床资料，探讨出血性卒中患者复发相关危险因素；采用随机分组法将原始数据分为建模队序列及验证序列，建模序列进行单因素、多因素分析及模型构建，用C指数、ROC曲线、标准曲线及临床决策曲线评估模型的区分度、准确性和临床效用；验证序列对模型的预测准确性进行验证。结果共纳入出血性卒中患者1 571例，其中再发出血性卒中253例，初发出血性卒中1 318例，构建原始数据集，以7:3原始数据集随机分为建模序列与验证序列。Logistic回归分析显示，病程(OR=3.548,95%CI:2.852～4.415)、吸烟(OR=1.499,95%CI:1.136～1.978)、饮酒(OR=3.330,95%CI:2.356～4.709)、男性(OR=1.424,95%CI:1.006～2.016)、高脂血症(OR=4.372,95%CI:2.227～8.584)、脑梗死(OR=2.254,95%CI:1.294～3.928)、高密度脂蛋白胆固醇(OR=2.034,95%CI:1.220～3.389)、凝血酶原时间(OR=1.103,95%CI:1.004～1.211)、同型半胱氨酸(OR=1.03,95%CI:1.014～1.047)是出血性卒中患者复发的相关影响因素，据此建立风险预测模型。该模型在建模序列及验证序列ROC曲线下面积分别为0.834(95%CI:0.810～0.859)和0.842(95%CI:0.804～0.880)，标准曲线均具有较强一致性，且Hosmer-Lemeshow拟合优度检验的结果分别为P=0.900和P=0.736，临床决策曲线阈值分别为<0.9和<0.95,表明模型具有较高区分度、校准度及临床效用。结论病程、吸烟、饮酒、性别、高脂血症、脑梗死、高密度脂蛋白胆固醇、凝血酶原时间、同型半胱氨酸是出血性卒中的独立危险因素，本研究所建立的风险预测模型，可及时识别出血性卒中复发高危患者，预防不良事件发生，有望在临床中进行推广。

关键词：出血性卒中复发危险因素预测模型

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壳聚糖席夫碱类絮凝剂的制备及性能研究

广州化工 2024年第1期52卷 46-49页

作者：李惠成李小菊张兵陇东学院化学化工学院甘肃庆阳745000

以戊二醛和壳聚糖(CTS)为原料,合成了壳聚糖席夫碱(G-CTS)。通过单因素实验,探讨最佳反应条件。利用黏度法和修订的Mark-Houwink公式,得壳聚糖席夫碱的黏均分子量和产物的缩合率。通过红外光谱(FTIR),X射线衍射(XRD)和扫描电子显微镜(S... 详细信息

以戊二醛和壳聚糖(CTS)为原料,合成了壳聚糖席夫碱(G-CTS)。通过单因素实验,探讨最佳反应条件。利用黏度法和修订的Mark-Houwink公式,得壳聚糖席夫碱的黏均分子量和产物的缩合率。通过红外光谱(FTIR),X射线衍射(XRD)和扫描电子显微镜(SEM)表征其结构。FTIR以及XRD谱图结果均表明壳聚糖发生了接枝和交联反应,SEM观察到其孔洞结构的增加。利用紫外光谱分析改性前后壳聚糖对水溶性染料的絮凝效果。实验结果显示,用戊二醛交联壳聚糖可以生成不同缩合率的壳聚糖席夫碱,对水溶性阴离子偶氮染料有优良的选择性和吸附作用,其中甲基橙24 h去除率达82.08%,7天去除率达到98.60%。

关键词：壳聚糖席夫碱絮凝剂缩合率

基于课程思政理念混合式教学在护理学导论课程中的应用研究

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智慧健康 2024年第1期10卷 154-159页

作者：惠静周菊邓清红来平英四川护理职业学院基础护理教研室四川成都610199

目的探讨基于课程思政理念混合式教学在护理学导论课程中的应用效果。方法选取某高校大专护理学专业大一2个班级学生为研究对象。采用抛硬币方式,将一个班作为干预组(n=49),另一个班作为对照组(n=50)。对照组采用传统教学模式,干预组采... 详细信息

目的探讨基于课程思政理念混合式教学在护理学导论课程中的应用效果。方法选取某高校大专护理学专业大一2个班级学生为研究对象。采用抛硬币方式,将一个班作为干预组(n=49),另一个班作为对照组(n=50)。对照组采用传统教学模式,干预组采用基于课程思政理念混合式教学。课程结束后比较两组研究对象的职业认同感得分和学业自我效能感得分。结果干预组的职业认同感得分(t=3.486,P<0.05)和学业自我效能感得分(t=3.051,P<0.05)均高于对照组。结论将基于课程思政理念混合式教学应用于护理学导论课程中,能够有效提高护生的职业认同感和学业自我效能感。

关键词：课程思政护理学导论混合式教学职业认同学业自我效能

Synthesis of indium tin oxide nano-polycrystalline powders by ultrasonic spray pyrolysis

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Rare Metals 2022年第10期41卷 3579-3584页

作者： Li-Hua Zhang Sheng-hui Guo Chao-Jin Zhou Jin-hui Peng Shao-Hua ju Jian-Bo Lan Yunnan Provincial Key Laboratory of Intensification Metallurgy Kunming650093China Key Laboratory of Unconventional Metallurgy Ministry of EducationKunming650093China National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology Kunming650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming650093China

Indium tin oxide(ITO) nano-polycrystalline powders were prepared by ultrasonic spray pyrolysis(USP) method using a precursor solution of indium and tin chlorides in a simple one-step process without any post-heat treatment,additives and other complex operations.The morphology and crystal structure of ITO powders were studied by thermogravimetric and differential thermal analysis(TG-DTA),X-ray diffraction(XRD),energy-dispersive spectrometer(EDS),scanning electron microscopy(SEM),laser particle size analyzer(LPSA),transmission electron microscope(TEM),high-resolution transmission electron microscopy(HRTEM) and selected area electron diffraction(SAED),respectively.The results indicate that pure cubic ITO solid solution could be obtained at and above the pyrolysis temperature of 600℃.Through adjusting the size of atomized precursor droplets,the particles with regular spherical shape and smooth surface are also obtained.The spherical particles have a narrow size distribution with a dominant diameter size in the range of 0.52-1.28 μm,and the average value is 1.01 μm.The clear lattice fringes in HRTEM image confirm a polycrystalline structure of ITO particles with the growth direction along(222) direction.

关键词： Indium tin oxide Ultrasonic spray pyrolysis Nano-polycrystalline powder Chloride precursor